Just to confirm, I’ve now downgraded both Flint 2’s back to 4.8.3 and my Wi-Fi has increased back to Max. as it was. All settings, including Adguard DNS blocklists and custom filtering rules have been maintained.
The 4.8.4 Firmware has been pulled from download because of issues, please see this Topic:
https://forum.gl-inet.com/t/4-8-4-pulled-for-download/67870/7